Voice coil motor, camera module, and electronic device using the same

ABSTRACT

A voice coil motor strongly attached to the base of a camera module comprises the base and a casing. The casing and the base are interlocked with each other. The casing is a hollow structure. The casing comprises a top surface and a side wall surrounding the top surface. The side wall and the base are engaged with each other. The side wall is extended in parts to form at least one extending leg. The extending leg extends to a side of the base away from the top surface and is bent toward the base.

FIELD

The subject matter relates to cameras, and in particular, to a voicecoil motor and electronic device using the voice coil motor.

BACKGROUND

Electronic devices, such as mobile phones or tablet computers, can havecamera modules. As the electronic device becomes thinner and lighter,the camera module also becomes thinner and lighter, by using smallercasings for example. However, as the casing becomes smaller, the contactarea between the casing and the base also becomes smaller. When thecasing and the base are bonded together using an adhesive, adhesionforce between the casing and the base becomes smaller. Therefore, thecasing and the base of the camera module can be easily separated.

Therefore, there is room for improvement in the art.

BRIEF DESCRIPTION OF THE DRAWINGS

Implementations of the present disclosure will now be described, by wayof embodiments only, with reference to the attached figures.

FIG. 1 is an exploded view of a voice coil motor according to a firstembodiment of the present disclosure.

FIG. 2 is a perspective view of the voice coil motor of FIG. 1.

FIG. 3 is an exploded view of a voice coil motor according to a secondembodiment of the present disclosure.

FIG. 4 is a perspective view of the voice coil motor of FIG. 3.

FIG. 5 is a cross-sectional view along line V-V of FIG. 4.

FIG. 6 is an exploded view of a voice coil motor according to a thirdembodiment of the present disclosure.

FIG. 7 is a perspective view of the voice coil motor of FIG. 6.

FIG. 8 is a perspective view of an electronic device including the voicecoil motor according to the embodiments disclosed herein.

DETAILED DESCRIPTION

It will be appreciated that for simplicity and clarity of illustration,where appropriate, reference numerals have been repeated among thedifferent figures to indicate corresponding or analogous components. Inaddition, numerous specific details are set forth in order to provide athorough understanding of the embodiments described herein. However, itwill be understood by those of ordinary skill in the art that theembodiments described herein can be practiced without these specificdetails. In other instances, methods, procedures, and components havenot been described in detail so as not to obscure the related relevantfeature being described. Also, the description is not to be consideredas limiting the scope of the embodiments described herein. The drawingsare not necessarily to scale and the proportions of certain parts may beexaggerated to better illustrate details and features of the presentdisclosure.

The term “comprising,” when utilized, means “including, but notnecessarily limited to”; it specifically indicates open-ended inclusionor membership in the so-described combination, group, series, and thelike.

First Embodiment

FIG. 1 shows a first embodiment of a voice coil motor 10 including acasing 11, an upper pressing plate 12, an upper elastic plate 13, amagnet 14, a lens holder 15, a coil 16, a lower elastic plate 17, anauxiliary frame 18, and a base 19. The casing 11 and the base 19 areengaged together to form a receiving structure. The upper cover pressingplate 12, the upper elastic plate 13, the magnet 14, the lens holder 15,the coil 16, the lower elastic plate 17, and the auxiliary frame 18 aresequentially disposed in the receiving structure.

The lens holder 15 can receive a lens (not shown). The magnet 14 isdisposed between the lens holder 15 and the casing 11. The upper elasticplate 13 and the lower elastic plate 17 are at the opposite sides of thelens holder 15. The magnet 14 and the coil 16 are fixed to the lensholder 15. When the coil 16 is energized, a magnetic field acts on themagnet 14. The lens holder 15 is repulsed relative to the lens holder 15to achieve autofocus. The upper elastic plate 13 and the lower elasticplate 17 can drive the lens back to the lens holder 15. The upper coverpressing plate 12 is disposed between the upper elastic plate 13 and thecasing 11.

With reference to FIG. 2, the casing 11 has a hollow structure, andincludes a top surface 111 and a number of side walls 112 around the topsurface 111. The top surface 111 defines an opening 113 facing the lens.

The side wall 112 includes a plurality of adhesive injection openings115. The adhesive injection opening 115 are defined at the edge of theside wall 112 which is away from the top surface 111. In one embodiment,the casing 11 is rectangular. There are four side walls 112. At leasttwo adhesive injection openings 115 are defined at the edge of each sidewall 112. In other embodiments, the casing 11 may be cylindrical, andthe casing 11 may include only one side wall 112 surrounding the edgesof the top surface 111.

Extending legs 114 extend from the edge of the side wall 112, that isadjacent to the base 19, along a direction away from the side wall 112.That is, the extending legs 114 are bent relative to the side wall 112.The ends of the extending legs 114 near the side wall 112 are spacedfrom the adhesive injection openings 115. In other embodiments, there isonly one extension leg 114.

The base 19 includes a substrate 191. The casing 11 is engaged with thesubstrate 191. In one embodiment, the edges of the base 19 furtherdefine a plurality of receiving grooves 193. The extending legs 114 arereceived in the receiving groove 193. The size of the receiving groove193 is not less than the size of the extension leg 114. In otherembodiments, the base 19 may further include a plurality of throughholes (not shown) penetrating through the substrate 191, and the size ofthe through holes is larger than the size of the extending legs 114,thus the extending legs 114 can pass through the through holes. Thenumber of the extending legs 114 is equal to the number of the throughholes. The extending legs 114 are bent towards the substrate 191 throughthe through holes and are received in the receiving groove 193. Thenumber of the through holes may be one or zero.

The casing 11 and the base 19 can be bonded to each other by adhesiveinjected into the adhesive injection openings 115. The extending leg 114and the substrate 191 can be bonded to each other by injecting adhesiveinto the receiving groove 193. Thus, the casing 11 and the base 19 canbe bonded by injecting adhesive into the adhesive injection openings 115and the receiving grooves 193. The adhesive injection openings 115 andthe receiving grooves 193 are located at different positions, thus canprovide stronger adhesion by more than one direction to the casing 11and the base 19. Thus, the bonding strength between the casing 11 andthe base 19 can be stronger.

Second Embodiment

FIG. 3 shows a second embodiment of a voice coil motor 20 including acasing 21, an upper cover pressing plate 22, an upper elastic plate 23,a magnet 24, a lens holder 25, a coil 26, a lower elastic plate 27, anauxiliary frame 28, and a base 29. The casing 21 and the base 29 arefastened together to form a receiving structure. The upper coverpressing plate 22, the upper elastic plate 23, the magnet 24, the lensholder 25, the coil 26, the lower elastic plate 27, and the auxiliaryframe 28 are sequentially disposed in the receiving structure.

The lens holder 25 can receive a lens (not shown). The magnet 24 isdisposed between the lens holder 25 and the casing 21. The upper elasticplate 23 and the lower elastic plate 27 are at the opposite sides of thelens holder 25. The magnet 24 and the coil 26 are fixed to the lensholder 25. When the coil 26 is energized, the lens holder 25 is repulsedrelative to the lens holder 25 to achieve autofocus. The upper elasticplate 23 and the lower elastic plate 27 can drive the lens back to thelens holder 25. The upper cover pressing plate 22 is disposed betweenthe upper elastic plate 23 and the casing 21.

With reference to FIG. 4 and FIG. 5, the casing 21 has a hollowstructure. The casing 21 includes a top surface 211 and a side wall 212disposed around the top surface 211. The top surface 211 is providedwith an opening 213.

The side wall 212 includes a plurality of adhesive injection openings215. The plurality of adhesive injection opening 215 is defined at theedge of the side wall 212 which is away from the top surface 211. In oneembodiment, the casing 21 is rectangular. There are four side walls 212.At least two adhesive injection openings 215 are defined at the edge ofeach side wall 212. In other embodiments, the casing 21 may becylindrical, and the casing 21 may include only one side wall 212surrounding the edges of the top surface 211.

The extending legs 214 extend from the edge of the side wall 212, thatis adjacent to the base 29, along a direction away from the side wall212. That is, the extending legs 214 are bent relative to the side wall212. The ends of the extending legs 214 near the side wall 212 arespaced apart from the adhesive injection openings 215. In otherembodiments, there is only one extension legs 214.

The base 29 includes a substrate 291. The casing 21 is engaged with thesubstrate 291. In one embodiment, the edges of the base 29 furtherdefines a plurality of slots 294 and a plurality of receiving grooves293. The extending legs 214 are received in the receiving grooves 293.The size of the receiving groove 293 is not less than the size of theextension leg 214. A latching portion 216 is disposed at an end of theextending leg 214 near to the slot 294. The slot 294 is engaged with thelatching portion 216. In other embodiments, the base 29 may furtherincludes a plurality of through holes (not shown) penetrating throughthe substrate 291, and the size of the through holes is larger than thesize of the extending legs 214, thus the extending legs 214 can passthrough the through holes. The number of the extending legs 214 is equalto the number of through holes. The extending legs 214 are bent towardsthe substrate 291 through the through holes and are received in thereceiving grooves 293. The number of the through holes may be one orzero. The number of the grooves 294 is equal to the number of thelatching portions 216.

The casing 21 and the base 29 can be bonded to each other by injectingadhesive into the adhesive injection openings 215. The extending legs214 and the substrate 291 can be bonded to each other by injectingadhesive into the receiving grooves 293. The receiving groove 293 allowthe casing 21 and the base 29 to be bonded by injecting adhesive intothe adhesive injection openings 215 and the receiving grooves 293. Theadhesive injection openings 215 and the receiving grooves 293 arelocated at different positions, thus can provide stronger adhesion indifferent directions to the casing 21 and the base 29. Thus, the bondingstrength between the casing 21 and the base 29 can be stronger.

Third Embodiment

FIG. 6 shows a third embodiment of a voice coil motor 30 including acasing 31, an upper cover pressing plate 32, an upper elastic plate 33,a magnet 34, a lens holder 35, a coil 36, a lower elastic plate 37, anauxiliary frame 38, and a base 39. The casing 31 and the base 39 arefastened to form a receiving structure. The upper cover pressing plate32, the upper elastic plate 33, the magnet 34, the lens holder 35, thecoil 36, the lower elastic plate 37, and the auxiliary frame 38 aresequentially disposed in the receiving structure.

The lens holder 35 can receive a lens (not shown). The magnet 34 isdisposed between the lens holder 35 and the casing 31. The upper elasticplate 33 and the lower elastic plate 37 are at the opposite sides of thelens holder 35. The magnet 34 and the coil 16 are fixed to the lensholder 35. When the coil 36 is energized, the lens holder 35 is repulsedrelative to the lens holder 35 to achieve autofocus. The upper elasticplate 33 and the lower elastic plate 37 can drive the lens back to thelens holder 35. The upper cover pressing plate 32 is disposed betweenthe upper elastic plate 33 and the casing 31.

With reference to FIG. 7, the casing 31 has a hollow structure, and thecasing 31 includes a top surface 311 and a number of side walls 312around the top surface 311. The top surface 311 defines an opening 313which facing the lens.

The side wall 312 includes a plurality of adhesive injection openings315. The adhesive injection openings 315 are defined at the edge of theside wall 312 which is away from the top surface 311. In one embodiment,the casing 31 is rectangular. There four side walls 312. At least twoadhesive injection openings 315 are defined at the edge of each sidewall 312. In other embodiments, the casing 31 may be cylindrical, andthe casing 31 may include only one side wall 312 surrounding the edgesof the top surface 311.

Extending legs 314 extends from the edge of the side wall 312 that isadjacent to the base 39, along a direction away from the side wall 312.That is, the extending legs 314 are bent relative to the side wall 312.The ends of the extending legs 314 near the side wall 312 are spacedform the adhesive injection openings 315. In other embodiments, there isonly one extension leg 314.

The base 39 includes a substrate 391. The casing 31 is engaged with thesubstrate 391. In one embodiment, the edges of the base 39 furtherdefines a plurality of receiving grooves 393. The extending legs 314 arereceived in the receiving grooves 393. The size of the receiving groove393 is not less than the size of the extension leg 314. In otherembodiments, the base 39 may further includes a plurality of throughholes (not shown) penetrating through the substrate 391, and the size ofthe through holes is larger than the size of the extending legs 314 thusthe extending legs 314 can pass through the through holes. The number ofthe extending legs 314 is equal to the number of the through holes. Theextending legs 314 are bent towards the substrate 391 through thethrough holes and are received in the receiving grooves 393. The numberof the through holes may be one or zero. The base 39 further includes areinforcing layer 396. The reinforcing layer 396 is disposed on a sideof the substrate 391 away from the top surface 311. The reinforcinglayer 396 covers the surface of the extending leg 314 away from thesubstrate 391. The reinforcing layer 396 is fastened to the substrate391.

The casing 31 and the base 39 can be bonded to each other by adhesiveinjected adhesive into the adhesive injection openings 315. Theextending legs 314 and the substrate 391 can be bonded to each other byinjecting adhesive into the receiving grooves 393. So, the casing 31 andthe base 39 are bonded by injecting adhesive into the adhesive injectionopenings 315 and the receiving grooves 393. The adhesive injectionopenings 315 and the receiving grooves 393 are located at differentpositions, thus can provide stronger adhesion in different directions tothe casing 31 and the base 39. Thus, the bonding strength between thecasing 31 and the base 39 can be stronger.

An electronic device 1 includes a casing 50 and a camera module 60disposed in the casing 50. The camera module 60 further includes a voicecoil motor 70. The voice coil motor 70 can be any voice coil motor ofthe first, second, or third embodiments. With reference to FIG. 8, theelectronic device 1 is a mobile phone. In other embodiments, theelectronic device 10 may also be a personal computer, a smart homeappliance, an industrial controller, or the like. When the electronicdevice 10 is a mobile phone, the voice coil motor 70 can be a frontcamera and a face recognition unit.

The embodiments shown and described above are only examples. Therefore,many commonly-known features and details are neither shown nordescribed. Even though numerous characteristics and advantages of thepresent technology have been set forth in the foregoing description,together with details of the structure and function of the presentdisclosure, the disclosure is illustrative only, and changes may be madein the detail, including in matters of shape, size, and arrangement ofthe parts within the principles of the present disclosure, up to andincluding the full extent established by the broad general meaning ofthe terms used in the claims. It will therefore be appreciated that theembodiments described above may be modified within the scope of theclaims.

What is claimed is:
 1. A voice coil motor comprising: a base; and acasing engaged with the base; wherein the casing comprises a top surfaceand at least one side wall surrounding the top surface, the side wall isconnected to the base, at least one extending leg extends from an edgeof the side wall facing the base, and further extends along a directionfacing away from the side wall.
 2. The voice coil motor of claim 1,wherein edges of the base defines at least one receiving groove, each ofthe extending leg is received in a corresponding one of the receivinggroove.
 3. The voice coil motor according to claim 1, wherein aplurality of latching portions are disposed at an end of each of theextending leg away from the side wall, a plurality of grooves is definedat a side of the base away from the top surface, each of the extensionleg is bent towards the base and in contact with the base, and each ofthe plurality of latching portions is engaged with a corresponding oneof the plurality of grooves.
 4. The voice coil motor according to claim1, wherein the voice coil motor further comprises a reinforcing layer,the reinforcing layer is disposed at a side of the base away from thetop surface, and each of the extending leg is disposed between thereinforcement layer and the base.
 5. The voice coil motor of claim 4,wherein the reinforcing layer is engaged with the base.
 6. The voicecoil motor according to claim 2, wherein a size of the receiving grooveis not less than a size of the corresponding one of the extension leg.7. The voice coil motor according to claim 1, wherein the edge of theside wall further defines a plurality of adhesive injection openings,and at least a portion of the adhesive injection openings is in contactwith the base.
 8. The voice coil motor according to claim 7, wherein theadhesive injection openings are spaced apart from the extending leg.